A recent National Institutes of Health (NIH) study links a longer time to pregnancy to couples who have been exposed to certain persistent chemicals, including polychlorinated biphenyls (PCBs) or perfluorochemicals. The researchers say their findings suggest a link between these pollutants and pregnancy delay, but also say they cannot rule out the possibility that some of the delays were the result of exposure to multiple chemicals. The researchers also say their findings must be confirmed by subsequent studies. Exposure to PCBs and perfluorochemicals is...

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